**Describe the bug** The several results in the tutorial are not correctly drawn because of KeyboardInterrupt. I found there are two KeyboardInterrupt at - The creating Hamiltonian at [Monte Carlo Sampling tutorial](https://openjij.github.io/OpenJij/tutorial/en/physics/MonteCarloSampling.html) - running Dense mode at [Sparse/Dense QUBO Matrix in OpenJij](https://openjij.github.io/OpenJij/tutorial/en/005-benchmark_sparse_dense.html)